New Minecraft title update causes bugs, fix coming
Title Update 9 for Minecraft released earlier this week, bringing fans a new area to explore in The End, but apparently also brought some bugs along with it. Xbox Live Silver members have been reporting issues loading save files, while other users have reported lighting problems and lag. 4J Studios has responded via Twitter with a temporary fix for the save problems, telling Xbox Live Silver players to disconnect from Xbox Live before playing.
If you get "Connection to the server was lost" and are a LIVE Silver user, try disconnecting the ethernet cable. We are fixing this bug.
— 4J Studios (@4JStudios) April 4, 2013
The other issues mentioned are currently being worked on, and a fix should be available shortly for those affected.